Geoege hayden



(Specimens.)

G; HAYDEN.

EXPANDING AND ANTI FRICTION METAL. No. 309,350. Patented De0. 16, 1884.

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en TATE GEORGE HAYDEN,

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OF CHICAGO, ILLINOIS, ASSIGNOR OF ONE-HALF TO JOSEPH DUYER, OF SAMEPLACE.

EXPANDENG AND ANTHFRICTION METAL.

SPECIFICATION forming part of Letters Patent No. 309,350, dated December16, 1884.

Application filed June 28, 1884. (Specimens) To all whom it may concern:

Be it known that I, Gnoncn HAYDEN, of the city of Chicago, in the countyof Cook and State of Illinois, have invented anew and useful Improvementin Expanding and Anti Friction Metal, of which I declare the followingto be a full, clear, and exact description.

The object of my invention is to provide a metallic alloy whichpossesses to a high degree the qualities of toughness and anti-friction,and which expands in cooling.

To this end it con ists in the combination of zinc, tin, and antimony,in the following proportions by weight: zinc, one thousand partsantimony, seventy parts 5 tin, sixty parts.

I find the following to be the preferable method of preparing the saidalloy, although I do not desire orintend to be confined thereto: Thezinc is first melted, when the antimony, which should be melted in aseparate crucible, is poured in and the two metals thoroughly mixed. Thetin, which should be granulated or reduced to small pieces, is nowscattered slowly into the molten 1nass,where it immediately melts. Theingredients are thoroughly mixed, hen the alloy is ready forimmediateuse; or it may be drawn off into bars or bricks, to be remelted and usedon any subsequent occasion. This metal is especially designed to be usedupon sheave-pulleys over which run iron or steel cables, as isillustrated in the accompanying drawing, which represents a crosssectionof a pulley designed for cast-ir0n, is constructed preferably with thecentral portion of the outer rin1,A, depressed or cut away, leaving aturned-in annular flange, a a, on each side thereof. The bearingsurfacefor the cables is prepared by casting into said depression in the rimthe hereinbefore-described alloy while the pulley rests in aproperly-prepared mold. In cooling, this metal 13 expands to a slightdegree, and therefore when cool fits tightly in said de pression, and issecurely retained therein by the annular flanges c a. This metal is verytough, and does not crack either in cooling or at any time, and byreason of its anti-friction qualities it does not cut the cable norreadily Wear away itself, thus making it veryvaluable for thebearing-surface of pulleys. It may also be used for journal-boxes orlinings, or in any other place where atougl1,durable anti-friction orexpanding metal is re quired.

Having thus described my inyention, what I claim as new, and desire tosecure by Letters Patent, is-

The herein-described anti-friction and ex- )andin metal consistin ofzinc, tin and anb b 7 such use. The pulley, which is usually of

